Phospha derivatives of tris(2-aminoethyl)amine (tren) and tris(3-aminopropyl)amine (trpn): synthesis and complexation studies with group 4 metals
The N,N′,N″-triphenyl-substituted derivative of tris(2-aminoethyl)phosphine (Ph3-phospha-tren, P(CH2CH2NHR)3, R = Ph) and four derivatives of the related tris(3-aminopropyl)phosphine (phospha-trpn, P(CH2CH2CH2NHR)3, R = iPr, tBu, SitBuMe2, Ph) have been synthesized in addition to the parent phospha-...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
March 12, 2015
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| In: |
Organometallics
Year: 2015, Volume: 34, Issue: 6, Pages: 1118-1128 |
| ISSN: | 1520-6041 |
| DOI: | 10.1021/acs.organomet.5b00065 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acs.organomet.5b00065
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| Author Notes: | Malte Sietzen, Sonja Batke, Lukas Merz, Hubert Wadepohl, and Joachim Ballmann |
| Summary: | The N,N′,N″-triphenyl-substituted derivative of tris(2-aminoethyl)phosphine (Ph3-phospha-tren, P(CH2CH2NHR)3, R = Ph) and four derivatives of the related tris(3-aminopropyl)phosphine (phospha-trpn, P(CH2CH2CH2NHR)3, R = iPr, tBu, SitBuMe2, Ph) have been synthesized in addition to the parent phospha-trpn. Out of these ligand systems, only the N,N′,N″-triphenyl-substituted phospha-trpn derivative P(CH2CH2CH2NHPh)3 was found to be suitable for coordination to group 4 metals. For titanium, zirconium, and hafnium, the C3-symmetric endo-P-configured dimethylamido complexes Ph[PN3]M(NMe2) of the former ligand have been prepared and converted into the corresponding triflates Ph[PN3]M(OTf). Starting from these triflates, the benzyl complexes Ph[PN3]M(Bn) (M = Ti, Zr, Hf) have been obtained via reaction with Bn2Mg(THF)2. In case of titanium, the benzyl species Ph[PN3]Ti(Bn) is prone to thermal elimination of toluene, which results in the formation of a cyclometalated species. These findings are discussed in context with the very few group 4 trisamidophosphine complexes that have been reported earlier. |
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| Item Description: | Gesehen am 17.06.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1520-6041 |
| DOI: | 10.1021/acs.organomet.5b00065 |